Hunter HP400
Hunter HP400 Round Tower Air Purifier User Manual
Model: HP400
Product Overview
The Hunter HP400 Round Tower Air Purifier is designed for small rooms, offering advanced air purification. Its sleek cylindrical design features exposed hardware, making it a modern addition to any space. This unit incorporates True HEPA filtration and an EcoSilver® pre-filter to effectively address common airborne particles and odors.

Figure 1: Hunter HP400 Round Tower Air Purifier (White & Silver)
Key Features
- Filter Replacement Indicator: Notifies you when it's time to change the filters, ensuring optimal performance.
- Optional LED Accent Light: Provides ambient lighting or can function as a nightlight.
- True HEPA Filtration: Captures up to 99.97% of airborne particles as small as 0.3 microns, including dust, pollen, pet dander, mold spores, and smoke.
- EcoSilver® Pre-Filter: Utilizes coconut carbon to neutralize harmful VOCs and household odors, while silver nanoparticles inhibit the growth of microorganisms on the filter.
- Multiple Fan Speeds & Sleep Mode: Allows for customized airflow and quiet operation for undisturbed rest.
- Timer Function: Set the unit to operate for 2, 4, or 8 hours.
- Compact Design: Small footprint (7.7"D x 7.7"W x 16.7"H) ideal for small rooms and travel.
- Effective Coverage: Cleans the air in a 150 sq. ft. room over 3 times per hour.

Figure 2: Control Panel Overview

Figure 3: Two-Stage Filtration System

Figure 4: Compact Dimensions

Figure 5: Room Size Air Exchange Rates
Setup
Before first use, ensure all packaging is removed and the filter is properly installed. The unit comes with the filter pre-installed, but it's good practice to check its seating.
- Place the air purifier on a flat, stable surface.
- Ensure the unit is unplugged from the power outlet.
- Turn the bottom of the air purifier counterclockwise to remove it.
- Verify the filter is correctly seated inside the unit. If replacing, follow the maintenance instructions.
- Replace the bottom cover by aligning it and turning clockwise until it locks into place.
- Plug the power cord into a standard electrical outlet.

Figure 6: Filter Installation and Replacement Steps
Operating Instructions
The Hunter HP400 features a user-friendly digital control panel on its top surface. Refer to Figure 2 for button locations.
- On/Off Button: Press once to turn the unit on or off.
- Speed/Sleep Button: Cycles through fan speeds (1, 2, 3) and a quiet Sleep Mode. Press repeatedly to select desired speed.
- Timer Button: Sets the operating time for 2, 4, or 8 hours. The unit will automatically turn off after the selected duration.
- Accent Light Button: Toggles the blue LED accent light on or off.
- Filter Indicator: This light illuminates when it's time to check or replace the filter.
Demonstration Videos
HP400/HP450UV Air Purifier Smoke Test
This video demonstrates the effectiveness of the Hunter HP400 air purifier in removing smoke from an enclosed space, showcasing its rapid air purification capabilities.
Hunter HP400 - Breathe Life Into Every Room
An overview video highlighting the features and benefits of the Hunter HP400 air purifier, including its design, filtration system, and ease of use in various home environments.
Maintenance
Regular maintenance ensures the longevity and efficiency of your Hunter HP400 air purifier.
Filter Replacement
The HEPA filter should be changed every 6-12 months, or more frequently depending on air quality and environmental factors. The Filter Indicator light on the control panel will illuminate when a filter change is recommended.
- Unplug the air purifier from the power outlet.
- Turn the bottom of the air purifier counterclockwise to remove it.
- Carefully remove the old filter from the unit by pulling it out.
- Wrap the new pre-filter around the new HEPA filter and secure the pre-filter by pressing down on it.
- Place the new filter back into the unit, ensuring the sticker side faces out.
- Replace the bottom cover and lock it into place by turning clockwise.
- Plug the unit back in.
For visual guidance, refer to Figure 6 in the Setup section.
Troubleshooting
If you encounter any issues with your Hunter HP400 air purifier, please review the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not turn on. | Not plugged in; Power outlet issue; Unit malfunction. | Ensure power cord is securely plugged into a working outlet. Try a different outlet. If issue persists, contact customer support. |
| Airflow is weak or no air is coming out. | Blocked air intake/outlet; Clogged filter; Incorrect filter installation. | Check for obstructions around air intake and outlet. Replace filter if indicator light is on or if it appears dirty. Ensure filter is installed correctly. |
| Unusual noise from the unit. | Loose filter; Obstruction inside unit; Unit placed on uneven surface. | Check filter seating. Unplug and carefully inspect for foreign objects. Place unit on a flat, stable surface. |
| Filter indicator light remains on after filter change. | Filter reset not performed. | Consult the full user manual for specific filter reset instructions, usually involves pressing and holding the filter indicator button. |
For further assistance, please contact Hunter customer support.
Specifications
| Attribute | Detail |
|---|---|
| Model Number | HP400 |
| Brand | Hunter |
| Color | White & Silver |
| Product Dimensions | 7.7"D x 7.7"W x 16.7"H |
| Item Weight | 6.24 pounds |
| Floor Area Coverage | 106 Square Feet (CADR for 150 sq. ft. room, 3+ air changes/hour) |
| Filtration Type | True HEPA, EcoSilver® Pre-Filter |
| Controller Type | Button Control |
| Certifications | EPA Certified, CARB Certified |
| UPC | 850001466912 |
| Care Instructions | Change HEPA filter every 6-12 months, or more often depending on air quality and environmental factors. |
| Included Components | Air Purifier, Manual |
Warranty & Support
The Hunter HP400 Round Tower Air Purifier comes with a 5-year limited warranty from the manufacturer.
For warranty claims, technical support, or any product-related inquiries, please contact Hunter Fan Company customer service. Refer to the contact information provided in the original product packaging or on the official Hunter website.
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